Bug 214483

Summary:	REGRESSION (r264190?): ASSERTION FAILED: !needsLayout() on tiled-drawing/scrolling/fast-scroll-iframe-latched-select.html
Product:	WebKit	Reporter:	Truitt Savell <tsavell>
Component:	Layout and Rendering	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	bfulgham, simon.fraser, webkit-bot-watchers-bugzilla, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
See Also:	https://bugs.webkit.org/show_bug.cgi?id=214651

Description Truitt Savell 2020-07-17 10:24:26 PDT

tiled-drawing/scrolling/fast-scroll-iframe-latched-select.html

This test is a flaky crash on Mac wk2

History:
https://results.webkit.org/?suite=layout-tests&test=tiled-drawing%2Fscrolling%2Ffast-scroll-iframe-latched-select.html

Crash Log:
CRASHING TEST: tiled-drawing/scrolling/fast-scroll-iframe-latched-mainframe.html

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.JavaScriptCore      	0x00000002d3de75de WTFCrash + 14 (Assertions.cpp:295)
1   com.apple.WebCore             	0x00000002b5a91cfb WTFCrashWithInfo(int, char const*, char const*, int) + 27
2   com.apple.WebCore             	0x00000002b9f8fb4b WebCore::RenderView::paint(WebCore::PaintInfo&, WebCore::LayoutPoint const&) + 123 (RenderView.cpp:306)
3   com.apple.WebCore             	0x00000002b9e39748 WebCore::RenderLayer::paintBackgroundForFragments(WTF::Vector<WebCore::LayerFragment, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&, WebCore::GraphicsContext&, WebCore::GraphicsContext&, WebCore::LayoutRect const&, bool, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::RenderObject*) + 648 (RenderLayer.cpp:5029)
4   com.apple.WebCore             	0x00000002b9e359ae WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>) + 2574 (RenderLayer.cpp:4676)
5   com.apple.WebCore             	0x00000002b9e590fd WebCore::RenderLayerBacking::paintIntoLayer(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, WebCore::IntRect const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::EventRegionContext*)::$_21::operator()

Comment 1 Radar WebKit Bug Importer 2020-07-17 10:24:44 PDT

<rdar://problem/65732154>

Comment 2 Alexey Proskuryakov 2020-07-18 11:05:35 PDT

This has very rarely happened on internal bots before, but very sharply became frequent on 2020-07-09. Possibly https://trac.webkit.org/r264190